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6 hour timed challenge, to complete as many or as few 3.75 mile laps as you choose on the day. 7 laps for a marathon, 8+ for an ultra, there will also be a half marathon option with a shorter 4th lap and a 50km option with a shorter 9th lap.rnA flat route on the Thames Path between Windsor and Dorney with views of the castle and passing Windsor Racecourse, Boveney Lock and the Church of St Mary Magdalene.